High-resolution study of excited0+states in200Hg and202Hg

Abstract

We used the high-resolution Q3D magnetic spectrograph at the Maier-Leibnitz Laboratory (MLL) Tandem accelerator in Munich to study 200

Nuclear shape coexistence: A study of the even-even Hg isotopes using the interacting boson model with configuration mixing

“…For the mass A=196 and A=198 Hg isotopes, recent experiments using the HORUS cube γ-ray spectrometer and γ − γ angular correlation measurements, made it possible to determine multipole mixing ratios, spins and energy spectra [135,136]. Moreover, in the case of A=198, (p,t) two-neutron transfer reactions allowed to map out the presence of a number of 0 + states [137].…”

Spectroscopy of 232U in the (p,t) reaction: More information on 0+ states

“…The main goal of many studies using two-neutron transfer in the regions of rare earth, transitional and spherical nuclei [4][5][6][7][8][9] was to collect information only about the 0 + states, their energies and excitation cross sections. At the same time the states with non-zero spin are intensively excited in the (p,t) reaction and information about them can be obtained from the analysis of the angular distributions.…”

“…13 shows the 0 + state spectra of studied actinides and as an example one of the rare earth nucleus, 154 Gd. In the rare earth region, spin-parity values 0 + were assigned for many nuclei using the triton angular distributions for only three [5,8] and even two [9] angles, exploring the fact that the L = 0 transfer angular distribution peaks strongly at forward angles. As one could see, some of the L = 2 and 4 angular distributions also peak strongly at forward angles.…”

“…Subsequent analysis is performed within the distortedwave Born approximation (DWBA). In addition to our studies on the actinide nuclei 230 Th, 228 Th, 232 U, the neighbouring odd nucleus 229 Pa [2], and most recently on 240 Pu [3], the majority of studies on 0 + excitations was carried out in the regions of rare earth, transitional and spherical nuclei [4][5][6][7][8][9]. Most of these studies were limited to measuring the energies and excitation cross sections of 0 + states.…”

New data on $0^+$ states in $^{158}$Gd

“…Intensive studies of the multiple 0 + states were triggered by the observation of 12 excitations with zero angular-momentum transfer via the (p,t) reaction in the odd nucleus 229 Pa [18] and 13 excitations in the even-even nucleus 158 Gd [9]. Then, many experiments were carried out through the (p,t) transfer campaign in the region of actinides [19][20][21][22][23][24] and rare earths [25][26][27][28][29]. A feature of some of these studies is that, simultaneously with 0 + states, many states with other spins of both parities have also been identified.…”